There are a few ways to remove chili seeds :

- Slice open the chili, use the knife to remove the core where the seeds are attached to and place the chili under running water to wash away the scattered seeds

- Cut off both ends of the chili. The put a chopstick ot straw through the chili, and poke out the core and seeds as you move along and then place the chili under running water to wash away the scattered seeds